一种改进的模糊聚类图像分割算法研究与仿真

针对相似图像分割过程中,输入像素数据在转换空间上存在的不连贯和幅度变化特征差异很小,像素的隶属关系很难准确界定,导致分割阀值设定过程出现较大衰减,分割误差较大的问题,提出一种改进的模糊聚类图像分割算法.分析了传统的模糊C-均值聚类图像分割算法的弊端,对像素模糊划分矩阵和聚类中心进行推导,将迭代过程中像素数据集对聚类隶属的可能性和不确定性关系融入分割目标函数中,依据可能隶属度和不确定隶属度建立改进分割准则函数,同时对像素聚类进行更新,实现图像分割.仿真结果验证了所提算法的有效性,结果表明,改进后的方法在分割检测过程中,图像误差明显减小.     

Influences of different modifiers on the disintegration of improved granite residual soil under wet and dry cyclesOA

The disintegration of granite residual soil is especially affected by variations in physical and chemical properties. Serious geologic hazards or engineering problems are closely related to the disintegration of granite residual soil in certain areas. Research on the mechanical properties and controlling mechanisms of disintegration has become a hot issue in practical engineering. In this paper, the disintegration characteristics of improved granite residual soil are studied by using a wet and d...     

一种6轴搬动机器臂运动方程逆解的改良算法

为了提高一种6轴搬动机器臂运动方程逆解的准确性、易推广性,以一种实际工业机器臂模型为研究对象,建立实体的D-H模型,进行运动学正解仿真与分析,以及运动学逆解算法的改良和编程,运用MATLAB求逆解,进行仿真并与实验测得的结果比较,验证了逆解改良算法的正确性,文中对机器臂运动方程的逆解改良算法可应用于高校的机器人教学中。     

Improved electrochemical properties of Li1.2Ni0.18Mn0.59Co0.03O2 by surface modification with LiCoPO4

Lithium-rich nickel–manganese–cobalt oxide, Li_1.2Ni_0.18Mn_0.59Co_0.03O₂, prepared by spray-dry process, exhibits rapid capacity fade and poor rate capability. The surface of Li_1.2Ni_0.18Mn_0.59Co_0.03O₂ can be modified with LiCoPO₄ through co-precipitation method in order to improve its electrochemical properties. The resultant LiCoPO₄ particles are in nano-scale and accumulate on the surface of the Li_1.2Ni_0.18Mn_0.59Co_0.03O₂ particles. The surface modification by LiCoPO₄ is shown to significantly improve both the cyclic performance and the rate capability of Li_1.2Ni_0.18Mn_0.59Co_0.03O₂.     

数据挖掘中关联规则的一种高效Apriori算法

在数据挖掘中关联规则的频繁项集计算时,通过一种改进的Apriori算法,即用升序替代原来的按字母次序对项集进行排序,可大大精简候选频繁集,而且能保持频繁集的完整性,减少计算开销。     

Automatic Region-Based Image Annotation Using an Improved Multiple-Instance Learning Algorithm

Many existing image annotation algorithms work under probabilistic modeling mechanism. In this paper, we formulate the problem as a variation of supervised learning task and propose an Improved Citation kNN （ICKNN） Multiple-instance learning （MIL） algorithm for automatic image annotation. In contrast with the existing MIL based image annotation algorithm which intends to learn an explicit correspondence between image regions and keywords, here we annotate the keywords on the entire image instead of its regions. Concretely, we first explore the concept of Confidence weight （CW） for every training bag （image） to reflect the relevance extent between a bag and a semantic keyword. It can be treated as a stage of re-ranking on training set before an- notation starts. Moreover, a modified hausdoriT distance is adopted for the ICKNN algorithm to solve the automatic annotation problem. The proposed annotation approach demonstrates a promising performance over 5,000 images from COREL dataset, as compared with some current algorithms in the literature.     

一种低功耗SoC设计中的时钟隔离技术

在一些复杂的SoC中,往往要使用嵌入式存储器,而双边访问的嵌入式存储器(DARAM)常用于许多低功耗的场合。这样,用时钟的双边沿来控制存储器的读写数据是不可避免的。这种时钟用作数据(clock as data)的情况通常会在SoC设计的逻辑物理综合阶段产生很多时序收敛的棘手问题,时钟隔离电路恰好能解决这个问题。实践证明,这种改进的时钟电路结构大大减少了设计的时序收敛时间和设计流程的复杂度。     

改进模糊相似选择方法在石油资源评价预测中的应用

根据模糊数学中的模糊相似选择原理,将改进模糊相似选择方法应用到石油资源的评价预测中,从而为石油资源的评价预测提供了一种新方法。     

Improvements on the uncorrelated optimal discriminant vectors

The algorithm and the theorem of uncorrelated optimal discriminant vectors (UODV) were proposed by Jin. In this paper, we present new improvements to Jin's method, which include an improved approach for the original algorithm and a generalized theorem for UODV. Experimental results prove that our approach is superior to the original in the recognition rate.     

斜阶跃信号激励下的RLC互连线时延模型

文章对斜阶跃信号激励下的RLC互连线时延模型进行了研究.用改进1阶模型逼近传输线的传输函数,得到了比较简洁的时延解析式.该模型计算所得的结果与SPICE仿真结果的误差小于5%.